Rewinding mechanism for cameras



April 24, 1945Y P. F, SPERRY "2,374,509

REWINDING MECHANISM FOR CAMERAS original Filed Nov. 17, 1941 2sheets-sheet 1 mmm" Wl V|l||| Winn@ www Iii g um 0) l 52,32) Wmllltllw'f Illu' /Zj/; Hum" 22 ff .25M

April 24, 1945.

P. F. sPERRY -REWINDING MECHANISM FOR CAMERAS 2 Sheets-Sheet 2 OriginalFiled Nov. 17, 1941 Patented Apr. 24, 1945 ,i claims. (c1. i-feo) lQTii's application is being meri as' division of thecopendingapplicationoiPhilmore F. Sperry, "SerialNo,` 419,457, filedNovember `1'o7`J `194:1, now Patent No. 2,323,576. Trhisinvention,relatesto modonjpicture `cameras ofthe type in whicriam `iilnfis4mounted rin the camera in `a liglitproof magazine havinga vshutterclosing'an` exposure f opening at the front face of the magazine, suchmagazine ,being` supported in the 'camera chamfber so as to be movableforwardly andbaclw'ardly ,o 1,0

into and out of operative position with'res'p'ect to the lens means atthe front of the casing.

b .'It is the principal ,object orthe present linvention to provide'animproved' construction of driving and `controlling means for `moving`thenlmww through the camerafor the exposure of successive portions ofthe lm, and it relates particularly to an improved arrangement of partsfor rewinding the iilm while still retained Within the magazine afterthe exposure.

This mechanism comprises improved `means for actuating the rewindingparts so as to permit the driving mechanism to slip to the necessaryextent with respect to the reel upon which the iilm is being rewound soas to accommodate the changing the invention;

Fig. 2 is a view similar to Fig. 1 but with the side plate and the frontfacing plate of the casing and the View finder all removed, and with themagazine carrier moved to its rearmost open position;

Fig. 3 is a face View of a fragmentary portion of la vertical wall ofthecarrier against which a magazineis positioned;

Fig. 4 is a side View of the operating parts of the camera, with theprincipal housing member and the magazine carrier and the adjacentpartition frame plate al1 removed for clearness of i1- lustration; and

Fig. 5 is a vertical sectional view taken substantiallyat the line 5-5of Fig. 4. 50

In the drawings, l0 indicates the casing of a camera embodying theimprovements, comprising a carrier Il in the form of a drawer slidableforwardly and backwardly in the casing for carrying a nlm magazine l2into and out of operative posi- 55 IIhe preferred means by 30 tion withrespect to a lenssystem lat the front face of the casing. side plate `Ilcarried by the casingserbvesj toc1oyse theiace' ofthedrawer Il wherrj`4he drawer isjin its 'forward' position. A

" upon whichthe' lens system,l3 is ,freilt mounted 1s provided'withacarrying loop I6 of A any Lappr'oved'fty'pe. j A' View` finder l` l 'Iisv mounted in convena 'ti pesi ipnjat ,the upper facev portion of thecasingi` fir partitionpl "I8 `serves to separate the chamberwithinwhichthe drawer Il is -rricuntedwfrcirr Vche l adjacent-spacewithin' the cas- In the arrangemen s ownin'FigJji, a mass of-mechanisnifis sncwnlfat tnef iefrfor driving and controllingvth'eseVeral parts of the camera.' Inl asmucn yairtliis mechanis'iriforms andv of `itself Yno'fpart oil prsent invention Vandis described4"more or less `in^ detail fin said "prior application Serial No.419,457, it is believed to be unnecessary to describe the same herein.

The means for driving the rewinding reel of the film magazine i2comprises a pinion I9 mounted on the outer face of the side wall 20 ofthe drawer Il, such pinion being mounted'by means of a shaft 2| which inthe operative arrangment of the parts is operatively connected with thelower reel o1 the magazine` for rotating such reel for rewinding thefilm thereon. The arrangement of the parts in themagazine by which thepinion I9 and shaft 2| are enabled to drive the rewinding reel form nopart of this invention. For actuating the pinion Is and the shaft 2l, anidler gear 22 is rotatably mounted on the partition plate I8 in iposition to be engaged by the pinion I5 when the drawer I'I is movedforwardly to the limit of its motion,.such idler gear 22 Ineshing with agear 23 carried by the motor housing 24 through which power istransmitted from the spring motor mounted in said housing.

The means for mounting the gear 23 upon the motor housing 24 comprisesaround `disc 25 xedly mounted on the cross plate portion of the housingso as to support the gear 23 rotatably in position, the gear 23 being inthe` form of a ring having a working iit about the disc. Next to thegear 23, a friction plate 26 in the form of a ring or Washer of cork isloosely mounted in position, such ring 26 being pressed against the faceof the gear by means of 'a spring plate 21 in the form` of a spider, thearms of which engage the outer face of the friction ring 26, the springplate 2l being connected with the housing 24 so as to rotate therewith.'I'he arrangement is such that power is applied frictionally'from thehoussnugly upon the reel Without yfrom tnefspirito'f the intentionhousingV yrnernbe'rtliitongh which powerA isvtransing 24 and the spring21 through the friction ring 26 to the gear 23.

The gear 23 and its cooperating driving train parts are arranged so asnormally to drive the rewindingfreel ofl thetmagazine at-.lthe maximum 5speed required for "iffrctively few'indi'ng the ,film at the start ofthe use of a fresh nlm. As the effective diameter of the rewinding reelincreases,l A

by reason of the accumulation of the film thereon, the gear 23 slipswith respectto theV housing 10 24 so as to insure that the Llm shall bewound iurineKV the` reelV or the lm, as is Well understo this type.

vWhile the form and arrangementoilparts as 15 above described arepreferredg"lthejinvention is,"y

not to be limited thereto xce'pt'sd far asLtfiieir claims may be solimited, it being understood that changes might well be made in thenform and arrangementof the parts without departing 20 l1. Arewindingmechanisrri fo comprising combination ""rn on'havingma housingmember through Wh mittedgja',disc-mounted 'o'n the ter iace of 'thehousing, 'a' ring gear rotatablyr ourt'ed'f'about said disc, Aa frictionplat ijnthe formpf a ring loosely mounted "on" th'ebuter facfoi'thefgeang y and a spring member ir'ifth'e vof ai spideri() carried bysaid housing witniitsiaims bearing' on the outer face of the frictionrngso as to cause said vgear totrotate by l ctifo Avvv n h lsaid*housing.

ZIA'` 'r'vvinding'n anisrnw r r a lnini camera, 'comprising` in` c ofmtion a motor n having ,a

mitteifa dise'mountgifoiiifiie'dqtepface of the 'in devicescf` power''is trans- '25 Agear-'rotatably mounted on the face of the lplate aboutsaid disc, afriction plate also in the form of airing mounted movably onthe outerface of the gear, and spring means mounted on said disc l so asto rotate with said rst named plate and servingto press said frictionplate against said gear for rotating the gear by friction.

- 4. 'A rewinding mechanism for a film camera, comprising in combinationva rotatably mounted plate through which powerv is transmitted' a discfixedly mounted on the 'faceof' said plate, a ring g'e'arrotatably'rnounted on the face ofthe plate about `said disc,r a frictionplate also in the forrn of a ring 'mounted `movably'onV the outer facepf'the gear, and a spring member in the form of a spider formed of thinresilient metalmounted on said disc so as to rotate lvvith saidrstlna'med plate with its arms bearing on th'e'outeriace'of the frictionring for pressing said 'friction ring against said ring gear and 'thuscausing therin'g gear to rotate by Yfriction withv said rst namedrotatabiy mountedplate.g` *A l I i l' HELEN n;-spnniasnf Deceased.

